I've been invading in the Royal Woods for a few hours today and just a few minutes ago I ran into a gank squad hanging out at Artorias's door. It wasn't that strange and I was able to kill one of the phantoms before getting scorched by the host's black flame and the other phantom's fire tempest.
Then I spawned back at the Sanctuary Guardian's bonfire which was a bit weird seeing as I had rested at the bonfire at Oolacile Sanctuary. So I head out to get back to the other bonfire and ran across this.
I think the host that killed me before must have done something to my game to make me suffer, but I love it. I think I might try to kill them both tomorrow as a challenge. I feel so honored.